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冰川冻土 ›› 2003, Vol. 25 ›› Issue (5): 597-602.

• 大气-植被-土壤相互作用研究 • 上一篇    

河西走廊中部沙漠植物δ13C值的特点及其对水分利用效率的指示

苏培玺, 陈怀顺, 李启森   

  1. 中国科学院, 寒区旱区环境与工程研究所临泽荒漠生态系统研究站, 甘肃, 兰州, 730000
  • 收稿日期:2003-05-03 修回日期:2003-08-07 出版日期:2003-10-25 发布日期:2012-04-26
  • 作者简介:苏培玺(1964-), 男, 甘肃会宁人, 副研究员, 2003年在中国科学院寒区旱区环境与工程研究所获博士学位, 主要从事干旱环境生物学与绿洲农业研究.E-mail:supx@ns.lzb.ac.cn
  • 基金资助:
    中国科学院知识创新工程方向性项目(KZCX3-SW-329);中国科学院知识创新工程重大项目(KZCX1-09-02);国家重点基础研究发展规划项目(G2000048704)资助

Characteristics of δ13C Values of Desert Plants and Their Water Utilization Efficiency Indicated by δ13C Values in the Desert of Central Hexi Corridor Region

SU Pei-xi, CHEN Huai-shun, LI Qi-sen   

  1. Linze Desert Ecosystem Station, CAREERI, CAS, Lanzhou Gansu 730000, China
  • Received:2003-05-03 Revised:2003-08-07 Online:2003-10-25 Published:2012-04-26

摘要: 通过分析河西走廊中部沙漠中几种木本植物叶片或同化枝的稳定碳同位素比率(δ13C)和碳同位素辨别力(Δ),以其作为水分利用效率(WUE)的指示,研究了本区沙漠植物叶片或同化枝δ13C值的季节变化特点,以及不同生境和不同水分状况下δ13C值的差异,并比较研究了绿洲防护林树种及绿洲作物.结果表明:梭梭和沙拐枣同化枝的δ13C值分别为-14.31‰和-14.82‰,Δ值在5‰~6‰之间;柠条、泡泡刺、花棒和红沙叶片的δ13C值分别为-25.75‰、-25.79‰、-26.38‰和-28.05‰,Δ值在16‰~20‰之间.几种沙漠植物长期水分利用效率大小的顺序为:梭梭≈沙拐枣>柠条≈泡泡刺≈花棒>红沙.

关键词: 河西走廊, 沙漠植物, 稳定碳同位素比率, 稳定碳同位素辨别力, 水分利用效率

Abstract: Temperate desert plants always grow in the high temperature, arid and water deficit environment throughout a year. Different plants have different photosynthetic organs to adapt extreme environmental conditions. The purpose of this paper is to probe into the characteristics of δ13C of leaves and assimilating shoots and into water use efficiency(WUE)of desert plants, and to provide a theoretical basic for protecting and fostering natural ecosystems of desert regions. The results achieved by the present study will serve restoring the degraded vegetation and maintaining the stability of protective eco-systems in the peripheric districts of oases. The δ13C values of leaves and assimilating shoots of desert plants in the desert of central Hexi Corridor region(39°19′~39°21′ N, 100°02′~100°21′ E, 1 368 ~ 1 380 m a.s.l.)were analyzed and discussed in this paper. δ13C of leaves and assimilating shoots and δ13C air were analysed with MAT-252 mass spectrometer. The characteristics of δ13C of leaves or assimilating shoots and WUE of plants indicated by δ13C values in this region were also studied. At the same time, comparative studies of shelterbelt arborous species and some oasis crops were also carried out. The results indicate that the δ13C values of assimilating shoots of Haloxylon ammodendron and Calligonum mongolicum are-14.31‰ and-14.8‰ respectively, and stable carbon isotope discrimination(Δ)is between 5‰~6‰. The δ13C values of leaves for Caragana korshinskii, Nitraria sphaerocarpa, Hedysarum scoparium and Reaumuria soongorica are-25.75‰,-25.79‰,-26.38‰ and-28.05‰ respectively, while Δ is between 16‰~20‰.. The long-term water use efficiency of several desert plant species can be ranked in the general order: H. ammodendronC. mongolicum>C. korshinskiiN. sphaerocarpaH. scoparium>R. soongorica.

Key words: Hexi corridor region, desert plant, stable carbon isotope ratio(δ13C or 13C/12C), stable carbon isotope discrimination(Δ), water use efficiency(WUE)

中图分类号: 

  • S718.55+4.2